Bug #46998 mysqlbinlog can't output BEGIN even if the database is included in a transaction

The 'BEGIN/COMMIT/ROLLBACK' log event could be filtered out if the
database is not selected by --database option of mysqlbinlog command.
This can result in problem if there are some statements in the
transaction are not filtered out.

To fix the problem, mysqlbinlog will output 'BEGIN/ROLLBACK/COMMIT' 
in regardless of the database filtering rules.

client/mysqlbinlog.cc:
  Skip the database check for BEGIN/COMMIT/ROLLBACK log events.
mysql-test/r/mysqlbinlog.result:
  Test result for bug#46998
mysql-test/t/mysqlbinlog.test:
  Added test to verify if the 'BEGIN', 'COMMIT' and 'ROLLBACK' are output
  in regardless of database filtering

mysql-test/t/mysqlbinlog.test

@@ -304,4 +304,66 @@ FLUSH LOGS;
 # We do not need the results, just make sure that mysqlbinlog does not crash
 --exec $MYSQL_BINLOG --hexdump --read-from-remote-server --user=root --host=127.0.0.1 --port=$MASTER_MYPORT  master-bin.000001 >/dev/null
 
+#
+# #46998
+# This test verifies if the 'BEGIN', 'COMMIT' and 'ROLLBACK' are output 
+# in regardless of database filtering
+#
+
+RESET MASTER;
+FLUSH LOGS;
+
+# The following three test cases were wrtten into binlog_transaction.000001
+# Test case1: Test if the 'BEGIN' and 'COMMIT' are output for the 'test' database 
+# in transaction1 base on innodb engine tables
+# use test;
+# create table t1(a int) engine= innodb;
+# use mysql;
+# create table t2(a int) engine= innodb;
+# Transaction1 begin
+# begin;
+# use test;
+# insert into t1 (a) values (1);
+# use mysql;
+# insert into t2 (a) values (1);
+# commit;
+# Transaction1 end
+
+# Test case2: Test if the 'BEGIN' and 'ROLLBACK' are output for the 'test' database 
+# in transaction2 base on innodb and myisam engine tables
+# use test;
+# create table t3(a int) engine= innodb;
+# use mysql;
+# create table t4(a int) engine= myisam;
+# Transaction2 begin
+# begin;
+# use test;
+# insert into t3 (a) values (2);
+# use mysql;
+# insert into t4 (a) values (2);
+# rollback;
+# Transaction2 end
+
+# Test case3: Test if the 'BEGIN' and 'COMMIT' are output for the 'test' database 
+# in transaction3 base on NDB engine tables
+# use test;
+# create table t5(a int) engine= NDB;
+# use mysql;
+# create table t6(a int) engine= NDB;
+# Transaction3 begin
+# begin;
+# use test;
+# insert into t5 (a) values (3);
+# use mysql;
+# insert into t6 (a) values (3);
+# commit;
+# Transaction3 end
+
+--echo #
+--echo # Test if the 'BEGIN', 'ROLLBACK' and 'COMMIT' are output if the database specified is exist
+--exec $MYSQL_BINLOG --database=test --short-form $MYSQLTEST_VARDIR/std_data_ln/binlog_transaction.000001
+--echo #
+--echo # Test if the 'BEGIN', 'ROLLBACK' and 'COMMIT' are output if the database specified is not exist
+--exec $MYSQL_BINLOG --database=not_exist --short-form $MYSQLTEST_VARDIR/std_data_ln/binlog_transaction.000001
+
 --echo End of 5.0 tests